EP0268905A1 - Mécanisme unidirectionnel débrayable pour moteurs synchrones - Google Patents

Mécanisme unidirectionnel débrayable pour moteurs synchrones Download PDF

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Publication number
EP0268905A1
EP0268905A1 EP87116430A EP87116430A EP0268905A1 EP 0268905 A1 EP0268905 A1 EP 0268905A1 EP 87116430 A EP87116430 A EP 87116430A EP 87116430 A EP87116430 A EP 87116430A EP 0268905 A1 EP0268905 A1 EP 0268905A1
Authority
EP
European Patent Office
Prior art keywords
motor
arm
abutment
finger
motor shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87116430A
Other languages
German (de)
English (en)
Inventor
William N. Roos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autotrol Corp
Original Assignee
Autotrol Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Autotrol Corp filed Critical Autotrol Corp
Publication of EP0268905A1 publication Critical patent/EP0268905A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/118—Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices
    • H02K7/1185—Structural association with clutches, brakes, gears, pulleys or mechanical starters with starting devices with a mechanical one-way direction control, i.e. with means for reversing the direction of rotation of the rotor

Definitions

  • This invention relates to improvements in small syn­chronous a.c. motors, and particularly to a mechanism that insures that such motors will always begin rotation in the same direction but which thereafter allows reverse rota­tion.
  • Small a.c. synchronous motors are often used as the prime mover for controlling the operation of valves and other mechanisms.
  • the motors typically have a permanent magnet rotor and a circular array of poles of alternating polarity disposed about the rotor.
  • Such motors when ener­gized are likely to begin rotation in either a clockwise or a counterclockwise direction. If the motor is stalled by an overload on its shaft, the motor will then reverse rotation. Most control applications require that the motor always rotate in the same direction upon being energized, and rotation in either direction will not be acceptable.
  • My invention provides a mechanism for insuring that the motor will always begin its rotation in the same direc­tion upon start up but the mechanism is disengaged shortly after start up so that the motor can reverse its direction when an overload condition is encountered.
  • the invention resides in a mechanism for use in association with the motor shaft of a synchronous a.c. motor.
  • the motor shaft has a radially projecting abutment.
  • a flexible arm has a finger that is normally positioned in the path of travel of the abutment to block rotation in one direction of rotation of the motor shaft while the arm, and its finger, will slide over the abutment when the motor shaft rotates in the opposite direction.
  • Means re­sponsive to the energization of the permanent magnet motor moves the arm and its finger out of the path of the abut­ment after the motor shaft has begun to rotate in such opposite direction.
  • the movement of the arm occurs after a time delay and the arm is held out of the path of the abutment for as long as the motor is energized.
  • the means for moving the arm with its finger comprise a solenoid whose coil is connected in parallel with that of the motor or a resist­ance heating element formed on one side of a bi-metal arm and connected in parallel with the motor.
  • the time delay is provided by a time delay switch in the first instance or by selecting the resistance in the heating element circuit.
  • a small synchronous a.c. con­trol motor 10 having a dish-shaped housing 11 with a cover plate 12 closing the open end of the hous­ing 11 and providing one or more tabs 13 for mounting the motor to a support.
  • the details of the motor construction are not relevant to the present invention except to note the presence of a motor shaft 14 disposed centrally of the motor, and a gear train which connects the output shaft 14 to a drive pinion 15 that projects through an opening in the cover 12.
  • the motor may be any of a variety of available synchronous motors such as, for example, model 414-340-20 manufactured and sold by the Singer Controls Division. Such motors operate on a.c. current and the speed reduction gearing can be selected to provide a de­ sired output speed for the driven pinion 15, such as one rpm.
  • the motor shaft 14 has an integral pinion 20 which is also formed integral with a base portion 21 that includes two laterally projecting ears that form abutments 22.
  • the motor shaft 14 is attached to a permanent magnet rotor 23 of the motor 10 by having the base portion 21 cemented to a face of the rotor 23.
  • the output shaft 14 with the pinion 20 and base portion 21 are mounted to ro­tate with the rotor 23 about a stationary rod 24.
  • the gear train includes three combination gears and pinions 25, 26 and 27 each mounted to rotate on a respective stationary rod.
  • the pinion of the gear and pinion 27 engages a gear 28 that is formed integral with the output pinion 15.
  • a motor of this type When a motor of this type is energized, it can start to rotate in either direction of rotation. There are instances of use for such motors in which rotation in either direction is an undesirable result.
  • One such use is as the motor to drive a pellet dropping device such as that illustrated and described in the co-pending applica­tion Serial No. 656,176, filed September 28, 1984 for "Chlorine Tablet Dispenser" and assigned to the assignee of this application.
  • the dispenser of such copending application has a very predictable rate at which it will dispense chlorine or other chemical tablets but only if the motor always rotates in one direction. The dispenser may, however, experience difficulties in dispensing a tab­let which can be caught between rotating and stationary surfaces. If that happens, the dispenser will jam and the motor will stall.
  • the motor will reverse itself to clear the jam and permit the dispenser to continue to function without the necessity of human intervention to clear the jam.
  • the mechanism of this invention is designed to insure that the motor will always begin rotation in the same direction upon energiza­tion but will be capable of reversing itself should it stall as by encountering a jam.
  • a flexible arm 30 is riveted or otherwise attached at one end to a casing 31 surrounding the stator windings of the motor 10.
  • the arm 30 is cantilevered from its attachment to the casing 31 and it includes a depending finger 32 which is placed in the path of travel of the abutments 22 on the base portion 21 when the flexible arm 30 is in its normal, relaxed condition.
  • the arm 30 mounts an upright pole piece 35 which is surrounded by an a.c. solenoid coil 36.
  • the coil 36 of the solenoid is connected in parallel with the motor 10 across a source of a.c. current 40.
  • the solenoid coil 36 is also connected in series with a time delay switch 41, such as in a time delay relay.
  • a on/off switch 42 is closed to energize the motor 10
  • the coil 36 will be energized after a suit­able time delay as established by the time delay switch 41.
  • the motor 10 is energized, if the rotor 23 seeks to rotate in a counterclockwise direction as viewed in Fig. 1, the flexible arm 30 will ride over the abutments 22 and not interfere with the rotation. If, however, the rotor 23 should seek to rotate in a clockwise direction as viewed in Fig. 1, the rotation will be blocked by the engagement of the finger with an abutment 22. The resulting stall on the motor will immediately cause the motor to reverse direction thereby moving in the desired counterclockwise direction.
  • the arm 30 is effectively removed from operating engagement by the pole piece 35 being lifted by the coil 36 to thereby remove the finger 32 from the path of travel of an abutment 22.
  • the rotor 23 can reverse its direction of rotation without encountering the finger 32.
  • the flexible arm 45 takes the form of a bi-metal element having a heater resis­tance element 46 mounted to the lower one of its bi-metal layers 47 and 48.
  • the element 46 would be connected in parallel with the motor 10.
  • the resistance element 46 Upon energization of the motor 10 by closing the switch 42, the resistance element 46 would also be energized to thereby warm the lower layer 48 and cause the arm 45 to deflect upwardly to remove a finger portion 49 from the path of travel of the abutment 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor And Converter Starters (AREA)
EP87116430A 1986-11-06 1987-11-06 Mécanisme unidirectionnel débrayable pour moteurs synchrones Withdrawn EP0268905A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/927,573 US4716325A (en) 1986-11-06 1986-11-06 Disengageable one-way mechanism for synchronous motors
US927573 1986-11-06

Publications (1)

Publication Number Publication Date
EP0268905A1 true EP0268905A1 (fr) 1988-06-01

Family

ID=25454922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116430A Withdrawn EP0268905A1 (fr) 1986-11-06 1987-11-06 Mécanisme unidirectionnel débrayable pour moteurs synchrones

Country Status (2)

Country Link
US (1) US4716325A (fr)
EP (1) EP0268905A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117143A (en) * 1991-03-22 1992-05-26 Electric Motors And Specialities, Inc. Anti-windmilling motor
NZ549662A (en) * 2006-09-04 2009-01-31 Wellington Drive Technologies Control of synchronous electrical machines
KR100793805B1 (ko) 2006-09-07 2008-01-11 엘지전자 주식회사 하이브리드 인덕션 모터
KR100793806B1 (ko) 2006-09-07 2008-01-11 엘지전자 주식회사 하이브리드 인덕션 모터

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947891A (en) * 1957-05-13 1960-08-02 Gen Electric Charged spring starters
GB1548645A (en) * 1977-03-10 1979-07-18 Smiths Industries Ltd Driving mechanismus including a synchronouss motor
JPS57113749A (en) * 1980-12-29 1982-07-15 Mitsubishi Marorii Yakin Kogyo Kk Small-sized synchronous motor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2873848A (en) * 1956-02-23 1959-02-17 Jeffrey Mfg Co Shaft locking means
US3225874A (en) * 1963-04-26 1965-12-28 Kingston Products Corp Unidirectional self starting device for synchronous motor
US3309635A (en) * 1965-05-24 1967-03-14 Westinghouse Electric Corp Circuit breaker with improved thermal and electromagnetic trip means
US3473058A (en) * 1967-01-23 1969-10-14 Richard P Landgraf Self-starting synchronous motor
US3501658A (en) * 1969-04-17 1970-03-17 American Mach & Foundry Bidirectional motor with directional control means for starting in either direction
US3747033A (en) * 1972-01-25 1973-07-17 Westinghouse Electric Corp Circuit breaker with improved trip means
US3795075A (en) * 1972-03-15 1974-03-05 Western Data Prod Inc Controllable turnstile

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2947891A (en) * 1957-05-13 1960-08-02 Gen Electric Charged spring starters
GB1548645A (en) * 1977-03-10 1979-07-18 Smiths Industries Ltd Driving mechanismus including a synchronouss motor
JPS57113749A (en) * 1980-12-29 1982-07-15 Mitsubishi Marorii Yakin Kogyo Kk Small-sized synchronous motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 211 (E-137)[1089], 23rd October 1982; & JP - A - 57 113 749 (MITSUBISHI) 15-07-1982 *

Also Published As

Publication number Publication date
US4716325A (en) 1987-12-29

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Inventor name: ROOS, WILLIAM N.